package com.interaction.example.odata.etag.command;
/*
* #%L
* interaction-example-odata-airline
* %%
* Copyright (C) 2012 - 2013 Temenos Holdings N.V.
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* #L%
*/
import com.temenos.interaction.core.command.InteractionCommand;
import com.temenos.interaction.core.command.InteractionContext;
import com.temenos.interaction.core.command.InteractionException;
public class UpdateEntityWithEtagCommand implements InteractionCommand {
private InteractionCommand updateEntityCommand;
private GETEntityWithEtagCommand getEntityCommand;
public UpdateEntityWithEtagCommand(InteractionCommand updateEntityCommand, GETEntityWithEtagCommand getEntityCommand) {
this.updateEntityCommand = updateEntityCommand;
this.getEntityCommand = getEntityCommand;
}
/* Implement InteractionCommand interface */
@Override
public Result execute(InteractionContext ctx) throws InteractionException {
assert(ctx != null);
//Check if the resource has been modified if an etag has been provided
InteractionContext getCtx = new InteractionContext(ctx, null, null, null, null);
getCtx.setResource(null);
String etag = getEntityCommand.getEtag(getCtx);
String ifMatch = ctx.getPreconditionIfMatch();
if(ifMatch != null && !ifMatch.equals(etag)) {
return Result.CONFLICT;
}
return updateEntityCommand.execute(ctx);
}
}